One of Ours: A Joe Erickson Mystery by Lynn-Steven Johanson

Death hits close to home in One of Ours when Chicago detective Joe Erickson is called to the scene of a fatal shooting. The victim, a police captain Joe knows well, had been working on his own time to solve a cold case before he retired. Determining he was silenced for getting too close to the truth, Joe picks up the trail and finds it teeming with corruption, executions, and a conspiracy involving a powerful city official. Can Joe crack the cold case and solve the murder while avoiding the wrath of the conspirators?